PAM8403 3W Stereo Amp Board
by Generic
SKU: PSA-CMP-PAM8403
No reviews yetTypical India street price
₹40–₹90
Class-D amp for 4–8 Ω speakers from a Pico/UNO DAC or DFPlayer.
Interface: Analog audio in
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Concept
A tiny switching audio amplifier.
A little theory
Class-D PWM analog. Don’t share a starving USB rail with motors. In the classroom, treat PAM8403 3W Stereo Amp Board as a beginner part using Analog audio in. Typical India street price is about ₹40–₹90. Always verify voltage and pin labels on your exact module — silk screens vary across clones. Start with a datasheet or trusted learn guide, power the part correctly, share GND with the MCU, and test with a simple blink/read sketch before building the full project. Measure voltages with a multimeter when something fails, and keep actuator current off the MCU regulator.
How it works in a project
5 V + GND, L/R in, speaker out. Keep speaker wires short.
Classroom & project use
- Talking project
- School radio
- Alarms that aren’t buzzers
Buying in India
Precautions
- Don’t short speaker pads
- Volume pot scratch = DC offset — add series cap if needed
Specifications
| Power | 3W x2 |
| Chip | PAM8403 |
| Category | LEDs & Indicators |
| Difficulty | Beginner |
| Voltage | 5V |
| Interface | Analog audio in |
Pinout
VCC | GND | AO (and DO if comparator module)
